doc(book/ffi): remove duplicate link reference `[libc]'

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xd1le 2015-11-28 16:58:39 +11:00
parent e9ac44026d
commit fb5f3faa6b

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@ -517,8 +517,6 @@ The [`libc` crate on crates.io][libc] includes type aliases and function
definitions for the C standard library in the `libc` module, and Rust links
against `libc` and `libm` by default.
[libc]: https://crates.io/crates/libc
# The "nullable pointer optimization"
Certain types are defined to not be `null`. This includes references (`&T`,